CA1328827C - Expanded polytetrafluoroethylene tubular container - Google Patents
Expanded polytetrafluoroethylene tubular containerInfo
- Publication number
- CA1328827C CA1328827C CA000605451A CA605451A CA1328827C CA 1328827 C CA1328827 C CA 1328827C CA 000605451 A CA000605451 A CA 000605451A CA 605451 A CA605451 A CA 605451A CA 1328827 C CA1328827 C CA 1328827C
- Authority
- CA
- Canada
- Prior art keywords
- container
- adsorbent
- sealed
- tubular structure
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/104—Alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/20—Organic adsorbents
- B01D2253/202—Polymeric adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/30—Physical properties of adsorbents
- B01D2253/302—Dimensions
- B01D2253/304—Linear dimensions, e.g. particle shape, diameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/30—Physical properties of adsorbents
- B01D2253/302—Dimensions
- B01D2253/308—Pore size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
Abstract
ABSTRACT
A container for adsorbing components present in an environment, which comprises a tubular structure of expanded, porous polytetrafluoroethylene sealed at both ends, so as to encapsulate an adsorbent present with the tubular structure.
A container for adsorbing components present in an environment, which comprises a tubular structure of expanded, porous polytetrafluoroethylene sealed at both ends, so as to encapsulate an adsorbent present with the tubular structure.
Description
132~827 -i FIELD OF THE INVENTION
This invention relates to a novel tubular container having an adsorbent material inside, and more specifically, to a novel container having very small pores in its walls that allow it to be ~ permeable to gases, selected liquids and solutes, but impermeable `I to other larger size materials and other selected liquids.
'1 .
BACKGROUND OF THE INVENTION
~, Contatners that conta~n adsorbents to remove vaporous impurit1es in the atmosphere are well known. For e~ample, they can be used to remove water vapor from air to obtain or maintain a dry atmosphere in appl~cations where a mo1sture-free atmosphere ~s ~mportant, as for example 1n keep~ng hygroscop1c materials dry.
~, Another example ~s the removal of organic vapors from air to avoid ~ contamination of local env1ronments sensltive to such vapors, as - for example in preventing head (st1ct~on) failures ~n computer dlsk dr~ves.
It is well known that greater effect~veness in remov~ng of material from the atmosphere by adsorpt10n can be obtained if the surface area of the adsorbent ls max~mlzed. Thus the smaller the adsorbent materlals ln particle s~ze, the greater the effect~veness ~n remov~ng 1mpurit~es. Unfortunately, the smaller the partkle s1ze, the greater amount of dust-llke fines that can be present. Moreover, even coarse adsorbent materials generate f1nes by mutual abras~on of the coarse granules.
~ To protect the adsorbent part~cles, a protect~ve porous :~ materlal 1.e., a material that permlts passage through tt of gaseous components or other components is usually employed to surround and encase the adsorbent. But ~f the pores of the protective materlal are too large, the f1nes of the adsorbant mater~al will escape through the pores and contaminate the outside env1ronment. To prevent such escape, 1t ls deslrable for the protect~ve covering to have pores small enough to prevent escape of very small dtameter fines, ~.e., f~nes on the order of 10 ~ m~crons, or even 1 m1cron or less 1n slze.
"'1 ~a ,~
,~1 ~ ~ ",;; ~ - .,"~,. ." ~
This invention relates to a novel tubular container having an adsorbent material inside, and more specifically, to a novel container having very small pores in its walls that allow it to be ~ permeable to gases, selected liquids and solutes, but impermeable `I to other larger size materials and other selected liquids.
'1 .
BACKGROUND OF THE INVENTION
~, Contatners that conta~n adsorbents to remove vaporous impurit1es in the atmosphere are well known. For e~ample, they can be used to remove water vapor from air to obtain or maintain a dry atmosphere in appl~cations where a mo1sture-free atmosphere ~s ~mportant, as for example 1n keep~ng hygroscop1c materials dry.
~, Another example ~s the removal of organic vapors from air to avoid ~ contamination of local env1ronments sensltive to such vapors, as - for example in preventing head (st1ct~on) failures ~n computer dlsk dr~ves.
It is well known that greater effect~veness in remov~ng of material from the atmosphere by adsorpt10n can be obtained if the surface area of the adsorbent ls max~mlzed. Thus the smaller the adsorbent materlals ln particle s~ze, the greater the effect~veness ~n remov~ng 1mpurit~es. Unfortunately, the smaller the partkle s1ze, the greater amount of dust-llke fines that can be present. Moreover, even coarse adsorbent materials generate f1nes by mutual abras~on of the coarse granules.
~ To protect the adsorbent part~cles, a protect~ve porous :~ materlal 1.e., a material that permlts passage through tt of gaseous components or other components is usually employed to surround and encase the adsorbent. But ~f the pores of the protective materlal are too large, the f1nes of the adsorbant mater~al will escape through the pores and contaminate the outside env1ronment. To prevent such escape, 1t ls deslrable for the protect~ve covering to have pores small enough to prevent escape of very small dtameter fines, ~.e., f~nes on the order of 10 ~ m~crons, or even 1 m1cron or less 1n slze.
"'1 ~a ,~
,~1 ~ ~ ",;; ~ - .,"~,. ." ~
SUMMARY OF THE INVENTION
This invention provides an adsorbent-containing device having such a protective covering. The device comprises a contatner for selectively adsorbing gaseous components present in an environment, which container comprises a tubular structure of expanded, porous polytetrafluoroethylene, said tubular structure being sealed at both ends, so as to encapsulate an adsorbent present within the tubular structure, the pores of said porous polytetrafluoroethylene having an average size of between about 0.1 and 1 micron, with substantially no pores greater than 5 micron in size.
..-DESCRIPTION OF THE DRAWINGS
F~gure 1 depicts an embodiment of the tubular container of the present invention, cut away to expose the interior of the tubular . container with adsorbent particles inside.
Figure 2 is a vlew of the tubular container cut along l~ne 2-2 of Figure 1, but without having any adsorbent particles inside.
DESCRIPTION OF THE INVENTION
~ ~ . .
~ : . .
;~ Refering to the Figures, the tubular container of the ; ~ invention compr~ses a tube 10 made of expanded porous polytetrafluoroethylene sealed at each end 11 so as to enclose adsorbent partkles 12.
The tube can be slightly to very flex~ble, depending on the strength of the polytetrafluoroethylene and the thickness of the walls. For most applications, the wall thlckness will be between 10 and 50 m~ls (250-1250 micron) on average. The expanded porous polytetrafluoroethylene tube is made accord1ng to the procedures descr1bed in U.S. Patents 4,110,392, 4,187,390, 4,075,679 and 3,953,566. More specifically, coagulated dispersion polytetrafluoroethylene (PTFE) is lightly lubricated and extruded as a paste through an annular-dle extruder. In a series of , ., : ~;;
~, ~ .
~328827 ~.
, heating and stretching steps the lubricant is evaporated away and the PTFE structure is expanded such that the percent void space or porosity is finally about 30-80%. The resulting tube is s~ntered by heating above the crystalline melt temperature of PTFE. Under ~i one set of condltions such a tube ~s made having an inside d~ameter of 0.079 inches, a wall thickness of 0.016 inches, pores 1 of maximum size 2.0 um, 50X poros~ty, and a~r permeab~l1ty through the wall of 0.005 cm/sec at 1.27 cm H20 P. Under d~fferent , conditions a tube is made of ~nside d~amenter 0.50 ~nches, a wall th~ckness of 0.039", a maximum pore s~ze of 3.5 um and a poros1ty of 70%.
In operation, once the tube ~s prepared, it ls sealed at one end by any suitable seallng means. For example, heat seal~ng can be carried out by using an adheslve such as polyethylene, or a melt-processlble tetrafluorethylene copolymer, and heating and compress~ng the end of the tube to result ln the conflgurat~on shown ~n the draw~ngs or simply fuston bond1ng the tube to ltself. An alternate method 1s to seal one end by means of a plug that ~s snuggly f~tted 1n the end.
The tube ~s then f111ed w1th an adsorbent part~culate, such as silica gel, act~vated carbon, calc1um sulfate, calc~um carbonate, activated alumina, molecular seives or the like. The rema~nlng ~ open end is then sealed in a manner 11ke the other end.
,1 In practice, an adsorbent-f~lled tubular conta~ner made of expanded porous polytetrafluoroethylene, about two ~nches long, 0.6 lnch diameter and 0.5 inch ~ns~de d~ameter fllled w1th 5 grams anhydrous,CaS04 (Calcium Sulfate) was used to adsorb water vapor ~i from the ~nter~or of a 9 l~ter sealed glass ~ar. The relat1ve -~ hum~d~ty 1ns~de the jar was reduced to 20X RH from an in~t~al 60X
~1 RH with the add1t1On of the adsorbent tube.
~ Pore s~ze is measured by m k roscopy.
-; Poros1ty (X vo1d space) ls measured by dens~ty (we~ght per ~ volume) measurements.
:, ~, .
,"~' .
This invention provides an adsorbent-containing device having such a protective covering. The device comprises a contatner for selectively adsorbing gaseous components present in an environment, which container comprises a tubular structure of expanded, porous polytetrafluoroethylene, said tubular structure being sealed at both ends, so as to encapsulate an adsorbent present within the tubular structure, the pores of said porous polytetrafluoroethylene having an average size of between about 0.1 and 1 micron, with substantially no pores greater than 5 micron in size.
..-DESCRIPTION OF THE DRAWINGS
F~gure 1 depicts an embodiment of the tubular container of the present invention, cut away to expose the interior of the tubular . container with adsorbent particles inside.
Figure 2 is a vlew of the tubular container cut along l~ne 2-2 of Figure 1, but without having any adsorbent particles inside.
DESCRIPTION OF THE INVENTION
~ ~ . .
~ : . .
;~ Refering to the Figures, the tubular container of the ; ~ invention compr~ses a tube 10 made of expanded porous polytetrafluoroethylene sealed at each end 11 so as to enclose adsorbent partkles 12.
The tube can be slightly to very flex~ble, depending on the strength of the polytetrafluoroethylene and the thickness of the walls. For most applications, the wall thlckness will be between 10 and 50 m~ls (250-1250 micron) on average. The expanded porous polytetrafluoroethylene tube is made accord1ng to the procedures descr1bed in U.S. Patents 4,110,392, 4,187,390, 4,075,679 and 3,953,566. More specifically, coagulated dispersion polytetrafluoroethylene (PTFE) is lightly lubricated and extruded as a paste through an annular-dle extruder. In a series of , ., : ~;;
~, ~ .
~328827 ~.
, heating and stretching steps the lubricant is evaporated away and the PTFE structure is expanded such that the percent void space or porosity is finally about 30-80%. The resulting tube is s~ntered by heating above the crystalline melt temperature of PTFE. Under ~i one set of condltions such a tube ~s made having an inside d~ameter of 0.079 inches, a wall thickness of 0.016 inches, pores 1 of maximum size 2.0 um, 50X poros~ty, and a~r permeab~l1ty through the wall of 0.005 cm/sec at 1.27 cm H20 P. Under d~fferent , conditions a tube is made of ~nside d~amenter 0.50 ~nches, a wall th~ckness of 0.039", a maximum pore s~ze of 3.5 um and a poros1ty of 70%.
In operation, once the tube ~s prepared, it ls sealed at one end by any suitable seallng means. For example, heat seal~ng can be carried out by using an adheslve such as polyethylene, or a melt-processlble tetrafluorethylene copolymer, and heating and compress~ng the end of the tube to result ln the conflgurat~on shown ~n the draw~ngs or simply fuston bond1ng the tube to ltself. An alternate method 1s to seal one end by means of a plug that ~s snuggly f~tted 1n the end.
The tube ~s then f111ed w1th an adsorbent part~culate, such as silica gel, act~vated carbon, calc1um sulfate, calc~um carbonate, activated alumina, molecular seives or the like. The rema~nlng ~ open end is then sealed in a manner 11ke the other end.
,1 In practice, an adsorbent-f~lled tubular conta~ner made of expanded porous polytetrafluoroethylene, about two ~nches long, 0.6 lnch diameter and 0.5 inch ~ns~de d~ameter fllled w1th 5 grams anhydrous,CaS04 (Calcium Sulfate) was used to adsorb water vapor ~i from the ~nter~or of a 9 l~ter sealed glass ~ar. The relat1ve -~ hum~d~ty 1ns~de the jar was reduced to 20X RH from an in~t~al 60X
~1 RH with the add1t1On of the adsorbent tube.
~ Pore s~ze is measured by m k roscopy.
-; Poros1ty (X vo1d space) ls measured by dens~ty (we~ght per ~ volume) measurements.
:, ~, .
,"~' .
Claims (11)
1. A container for selectively adsorbing components present in an environment, which comprises a tubular structure of expanded, porous polytetrafluoroethylene, said tubular structure being sealed at both ends so as to encapsulate an adsorbent present within the tubular structure, the pores of said polytetrafluoroethylene having an average size of between about 0.1 and 1 micron, with substantially no pores greater than 5 micron in size.
2. The container of claim 1 wherein the average wall thickness is between 10 and 50 mils.
3. The container of claim 2 wherein the length of the container is between 0.25 and 20 inches.
4. The container of claim 1 wherein the adsorbent is calcium sulfate.
5. The container of claim 1 wherein the adsorbent is activated carbon.
6. The container of claim 1 wherein the adsorbent is silica gel.
7. The container of claim 1 wherein the adsorbent is calcium carbonate.
8. The container of claim 1 wherein the adsorbent is activated alumina.
9. The container of claim 1 wherein the adsorbent is molecular sieves.
10. The container of claim 1 wherein the ends of the tube are sealed with an adhesive.
11. The contain of claim 1 wherein the adsorbent is sealed by fusion of PTFE to PTFE.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/218,779 US4830643A (en) | 1988-07-13 | 1988-07-13 | Expanded polytetrafluoroethylene tubular container |
| US218,779 | 1988-07-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1328827C true CA1328827C (en) | 1994-04-26 |
Family
ID=22816476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000605451A Expired - Lifetime CA1328827C (en) | 1988-07-13 | 1989-07-12 | Expanded polytetrafluoroethylene tubular container |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4830643A (en) |
| EP (1) | EP0428558B1 (en) |
| JP (1) | JPH07114911B2 (en) |
| AU (1) | AU3970589A (en) |
| CA (1) | CA1328827C (en) |
| WO (1) | WO1990000438A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3911080A (en) * | 1971-09-10 | 1975-10-07 | Wright H Dudley | Air pollution control |
| US3990872A (en) * | 1974-11-06 | 1976-11-09 | Multiform Desiccant Products, Inc. | Adsorbent package |
| US4110392A (en) * | 1976-12-17 | 1978-08-29 | W. L. Gore & Associates, Inc. | Production of porous sintered PTFE products |
| DE3004325A1 (en) * | 1979-02-08 | 1980-08-14 | Mitsubishi Gas Chemical Co | BAG CONTAINING OXYGEN ABSORPTION AGENTS AND CONTAINER LOCKED WITH IT |
| US4332845A (en) * | 1979-12-21 | 1982-06-01 | Mitsubishi Gas Chemical Company, Inc. | Oxygen absorbent-containing bag |
| US4383376A (en) * | 1981-03-18 | 1983-05-17 | Showa Denko Kabushiki Kaisha | Contact-dehydrating sheet for drying protein-containing food |
| GB2126123B (en) * | 1982-09-04 | 1986-08-06 | John Charles Cornforth | Adsorbent element |
| AT381463B (en) * | 1984-03-09 | 1986-10-27 | Sleytr Uwe B | DEFINED POROUS MEMBRANE, METHOD FOR THE PRODUCTION AND USE THEREOF |
| US4772300A (en) * | 1985-04-04 | 1988-09-20 | Multiform Desiccants, Inc. | Adsorbent cartridge |
| JPS627415A (en) * | 1985-07-04 | 1987-01-14 | Keinosuke Isono | Container of adsorbent and moisture absorbing device and deodorizing device using the same |
-
1988
- 1988-07-13 US US07/218,779 patent/US4830643A/en not_active Expired - Lifetime
-
1989
- 1989-07-12 CA CA000605451A patent/CA1328827C/en not_active Expired - Lifetime
- 1989-07-13 AU AU39705/89A patent/AU3970589A/en not_active Abandoned
- 1989-07-13 WO PCT/US1989/003028 patent/WO1990000438A1/en active IP Right Grant
- 1989-07-13 EP EP89908580A patent/EP0428558B1/en not_active Expired - Lifetime
- 1989-07-13 JP JP1508081A patent/JPH07114911B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07114911B2 (en) | 1995-12-13 |
| EP0428558B1 (en) | 1993-01-07 |
| WO1990000438A1 (en) | 1990-01-25 |
| EP0428558A1 (en) | 1991-05-29 |
| US4830643A (en) | 1989-05-16 |
| AU3970589A (en) | 1990-02-05 |
| JPH04501229A (en) | 1992-03-05 |
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| MKEX | Expiry |
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